HD74HC640, HD74HC643
Octal Bus Transceivers (with 3-state outputs)
REJ03D0637-0200 (Previous ADE-205-517)
Rev.
2.
00 Mar 30, 2006
Description
Each device has an active enable G and a direction control input, DIR.
When DIR is high, data flows from the A inputs to the B outputs.
When DIR is low, data flows from the B inputs to the A outputs.
The HD74HC640 transfers inverted data from one bus to other and the HD74HC643 transfers inverted data from the A bus to the B bus and true data from the B bus to the A bus.
Features
• High Speed Operation: tpd = 12 ns typ (CL = 50 pF) • High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating
Voltage: VCC = 2 to 6 V • Low Input Current: 1 µA max
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